Examine source code of Web Notification System

{
  "manifest_version": 2,
  "name": "Web Notification System",
  "version": "1.3",
  "description": "Generate and manage custom browser notifications with title, message, and icons.",
  "permissions": [
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7db39299-0893-4fc0-bb52-474dfbae73ce}"
    }
  }
}